554 BIOLOGICAL PHYSICS 



expedients, but none more structurally advanced, or more 

 -highly functioned, than that of the apparently " self- 

 determined " ciliary movements of the lining epithelial 

 .and endothelial cells of the various passages, tubes, and 

 ducts, through which course air with suspended particles, 

 ,or fluids with dissolved or suspended matters. 



